/*
 * Copyright 2009 Armando Blancas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package tests.taskgraph.tasks.data;

import java.io.IOException;

import junit.framework.Assert;
import junit.framework.JUnit4TestAdapter;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import taskgraph.channels.Channel;
import taskgraph.ports.InputPort;
import taskgraph.ports.OutputPort;
import taskgraph.tasks.data.Replicate;

public class ReplicateTest {

	/**
	 * Runs the test suite in this class from the command line.
	 * 
	 * @param args	Arguments are ignored.
	 */
	public static void main(String[] args) {
		org.junit.runner.JUnitCore.runClasses(ReplicateTest.class);
	}
	
	/**
	 * Provides compatibility with 3.x versions of JUnit.
	 * 
	 * @return A 3.x-compatible test suite.
	 */
	public static junit.framework.Test suite() {
		return new JUnit4TestAdapter(ReplicateTest.class);
	}
	
	private InputPort<Product> input;
	private OutputPort<Product> output;
	private OutputPort<Product> replica;
	
	@Before
	public void setup() {
		Channel<Product> channel = new Channel<Product>();
		output = channel.getOutputPort();
		replica = channel.getOutputPort();
		input = channel.getInputPort();
	}
	
	@After
	public void cleanup() throws IOException {
		output.close();
		input.close();
	}
	
    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Test the constructors.                                               | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/
	
	@Test
	public void defaultConstructor() {
		Replicate<Product> task = new Replicate<Product>();
		Assert.assertNotNull(task);
	}
	
	@Test
	public void defaultInstanceClass() {
		Replicate<Product> task = new Replicate<Product>();
		Assert.assertEquals(Replicate.class, task.getClass());
	}

	@Test
	public void constructorWithPorts() {
		Replicate<Product> task = new Replicate<Product>(input, output, replica);
		Assert.assertNotNull(task);
	}
	
	@Test
	public void constructorWithPortsAndClass() {
		Replicate<Product> task = new Replicate<Product>(input, output, replica);
		Assert.assertEquals(Replicate.class, task.getClass());
	}

    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Test the run method.                                                 | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/
	
	@Test
	public void testRun() throws IOException {
		
		/*
		 * This test goes line this:
		 * [@Test] ---input channel--->[Replicate]---output channel--->[@Test]
		 *                             [         ]---replica channel--->[@Test]
		 */
		Product[] products = {
			new Product(5005, "Notebook", 2.50f),
			new Product(1400, "Pencil",   0.49f),
			new Product(0001, "Eraser",   0.60f),
			new Product(4040, "Bookend", 10.25f)
		};

		Channel<Product> inputChannel = new Channel<Product>();
		Channel<Product> outputChannel = new Channel<Product>();
		Channel<Product> replicaChannel = new Channel<Product>();
		
		Replicate<Product> task = 
			new Replicate<Product>(inputChannel.getInputPort(), 
					               outputChannel.getOutputPort(),
					               replicaChannel.getOutputPort());
		
		// Write original data to output port of the task's input channel.
		OutputPort<Product> outputPort = inputChannel.getOutputPort();		
		for (Product p : products)
			outputPort.write(p);
		outputPort.close();
				
		task.run();
		
		InputPort<Product> originalPort = outputChannel.getInputPort();
		InputPort<Product> replicaPort = replicaChannel.getInputPort();

		// Now compare the output of both channels to the original objects.
		for (int i = 0; i < 4; ++i) {
			Assert.assertEquals(products[i],  originalPort.read());
			Assert.assertEquals(products[i],  replicaPort.read());			
		}
		originalPort.close();
		replicaPort.close();
	}

    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Negative tests for constructors.                                     | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/

	@Test(expected=IllegalArgumentException.class)
	public void constructorWithNullInputPort() throws IOException {
		new Replicate<Product>(null, output, replica);
	}

	@Test(expected=IllegalArgumentException.class)
	public void constructorWithNullOutputPort() throws IOException {
		new Replicate<Product>(input, null, replica);
	}

	@Test(expected=IllegalArgumentException.class)
	public void constructorWithNullReplica() throws IOException {
		new Replicate<Product>(input, output, null);
	}

    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Negative tests.                                                      | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/

}
